NASA spots six planets in tight orbits around sun-like star: NASA's Kepler team has spotted a star that hosts five planets in close proximity, with a sixth lurking a bit further out. It's the largest collection of planets yet spotted orbiting a single star, but the system appears to be quite unstable.

Your body's clock can cycle without genes: Our body's circadian clock, which regulates our eating and sleep/wake cycles, is driven by the transcription of genes into RNA. But a new study shows that red blood cells have a 24-hour cycle, even though they don't have any genes at all.